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Structural Concrete - Hassoun

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838 Chapter 20 Seismic Design of Reinforced <strong>Concrete</strong> Structures<br />

24"<br />

s = 5 in.<br />

24"<br />

s = 6 in.<br />

1.5"<br />

24"<br />

No. 5 crossties<br />

No. 4 hoops<br />

1.5"<br />

24"<br />

Figure 20.22<br />

Example 20.7: Reinforcement detailing.<br />

20.5.1.3 Joints of Special Moment-Resisting Frame. Joint of special moment-resisting frame<br />

should be detailed according to ACI Code, Section 18.8, as follows:<br />

20.5.1.3.1 Longitudinal Reinforcement Requirements. The development length l dh for a bar<br />

with a standard 90 ∘ hook using normal-weight concrete, for bar size no. 3 through no. 11, should

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